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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 01-30-2020, 02:06 PM   #1
stvcheetham
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Running like a pig

My M3 is running like a pig, changed the vanos and done the plate and seals but still the same. All new coil packs plugs etc. Going to check the oil pump tabs for damage// breakage next. Any other ideas would be appreciated.


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Old 01-30-2020, 02:11 PM   #2
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You have access to a code reader to pull codes? If not, go to autozone or the like and they can pull them for you for free. Then report back.

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Old 01-30-2020, 05:56 PM   #3
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Old 01-30-2020, 06:00 PM   #4
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Codes?
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Old 02-01-2020, 02:48 AM   #5
stvcheetham
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The cars in the garage and Im working away but my mate who is now trying to diagnose it just said that he was reading no compression on No2 cylinder. He has found some collets which appear to have come out. Difficult with me not being there.


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Old 02-01-2020, 03:20 AM   #6
stvcheetham
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P1300 random misfire


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Old 02-01-2020, 03:34 AM   #7
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I am trying to contact for the exact fault codes, beginning to doubt explanation. Will get back, thanks


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Old 02-01-2020, 09:41 AM   #8
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The cars in the garage and Im working away but my mate who is now trying to diagnose it just said that he was reading no compression on No2 cylinder. He has found some collets which appear to have come out. Difficult with me not being there.


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Can he give you compression on all cylinders? Hopefully not a head gasket...

What kind of collets? Pieces of spark plug threads?

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Old 02-02-2020, 04:20 PM   #9
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Collets are the two small inserts which fit into the top of the valve springs and lock into the stem of the valveClick image for larger version

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Old 02-02-2020, 11:27 PM   #10
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Ah, valve keepers. That's not good. Did he pop the valve cover to see what is going on? How many of those?

You basically have a free floating valve (or multiple valves) that open from cam lobe and close (unless they bent) by piston pushing them closed.

Possible cyl that has no compression has a bent valve since it didn't close by the valve spring and hit the top of piston? Is that the same cyl that is missing the keepers?

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Old 02-03-2020, 12:00 PM   #11
stvcheetham
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Strangely only 1 has been found so far, and it is from No2 cylinder (the one with no compression). Waiting to hear more today and am more relaxed about my mates skills regarding solving this properly, he has a mate with a specialist bmw garage. The strange thing about this is that I had no apparent incident whilst running which would have caused any engine damage. The misfire just appeared, then cleared then appeared again a few days later, so fingers crossed regarding engine damage. I'm sure I would have noticed a dropped valve.
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Old 02-23-2020, 05:27 AM   #12
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Has to be a broken valve spring to allow the collets to come out.
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Old 02-24-2020, 08:48 AM   #13
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Old 02-24-2020, 12:06 PM   #14
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Old 02-24-2020, 02:56 PM   #15
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Update: It seems that it may have dropped a valve but maybe without the expected consequences. The collets were refitted but immediately jumped back out. The original fault which developed never suggested a catastrophe such as a dropped valve; no piston to valve dilemma was heard or imagined, it just developed a misfire. Anyway the head will be off next and we'll see then how bad it is. Already said the damage will be rectified because the motor seemed so strong. Owning an M3 is something which always has spectre of such an occurance but still well worth it. We have the technology, ha and a wife who knows nothing about cars, luckily
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Old 02-27-2020, 04:51 AM   #16
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In your predicament perhaps a wife who knows a bit about BMW's might be handy to have around.
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Old 02-28-2020, 09:25 AM   #17
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Update: It seems that it may have dropped a valve but maybe without the expected consequences. The collets were refitted but immediately jumped back out. The original fault which developed never suggested a catastrophe such as a dropped valve; no piston to valve dilemma was heard or imagined, it just developed a misfire. Anyway the head will be off next and we'll see then how bad it is. Already said the damage will be rectified because the motor seemed so strong. Owning an M3 is something which always has spectre of such an occurance but still well worth it. We have the technology, ha and a wife who knows nothing about cars, luckily
If you own a cell phone, there are cheap endoscopes ($25-30 US) that you can use to look at the tops of your pistons to see if anything has impacted the pistons. Normally, I would recommend a leak down test, but with no compression on that cylinder it's a moot point.

Bottom line, if you have valve keepers laying around --- disaster. Regardless of anything else, you need to dig further and remove the cams to REALLY see what has happened. At a minimum (and if you are REALLY lucky) you have an issue with bent valves vs BROKEN valves. Ultimately, the head has to come off regardless.

Not knowing how much you know about these engines, an S54 top end is nothing like an M54 top end. Beisan Systems (US) has FANTASTIC tutorials about rebuilding the S54 VANOS as well as timing S54 cams. They are long, and extraordinarily detailed with great pictures. Download them to a laptop as at some 250 pages and in color, far too large to print. Bentley manuals have almost no info on the S54 engine. Also, I have a pdf showing almost every torque value you will need for assembly, and can email it to you.

Depending on the condition of the pistons and head, I can almost guarantee a replacement engine will be cheaper than a rebuild. (Hint; OEM S54 rings are over $2000US for a set of six.)
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Old 03-24-2020, 12:09 PM   #18
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Latest news: It's dropped a valve and subsequently cracked a piston and embedded shards of hot metal in piston top . Viewed all this through an endescope. Currently seeking replacement engine but the prices are astronomical. Very dubious now about a second hand motor coz don't want a repeat of this. Seems a rebuild is going to be the best, not the cheapest, option. Oh well if you run an M3 you are aware that s**** can happen. Way too much of a car to abandon, absolutely love it..
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Old 03-24-2020, 12:18 PM   #19
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Probably cheapest to just buy a running M3 car and save it for parts.

Quote:
Originally Posted by stvcheetham View Post
Latest news: It's dropped a valve and subsequently cracked a piston and embedded shards of hot metal in piston top . Viewed all this through an endescope. Currently seeking replacement engine but the prices are astronomical. Very dubious now about a second hand motor coz don't want a repeat of this. Seems a rebuild is going to be the best, not the cheapest, option. Oh well if you run an M3 you are aware that s**** can happen. Way too much of a car to abandon, absolutely love it..
Yeah, a running M3 will run you 10-20K. Mine is up for sale for $15K. USA $, Olney, MD. Got 112K miles on it plus about $4K of Dinan bits.
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Old 03-24-2020, 07:50 PM   #20
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keep looking.

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Latest news: It's dropped a valve and subsequently cracked a piston and embedded shards of hot metal in piston top . Viewed all this through an endescope. Currently seeking replacement engine but the prices are astronomical. Very dubious now about a second hand motor coz don't want a repeat of this. Seems a rebuild is going to be the best, not the cheapest, option. Oh well if you run an M3 you are aware that s**** can happen. Way too much of a car to abandon, absolutely love it..
Here's one on eBay but you'd need someone like a freight forwarder to pick it up for you:
https://www.ebay.com/i/324002710464?...SABEgJQ8_D_BwE
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